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United States Patent | 6,064,954 |
Cohen ,   et al. | May 16, 2000 |
Apparatus is disclosed for digitally encoding an input audio signal, for storage or transmission, comprising: a pitch detector for determining at least a dominant time-domain periodicity in the input signal; a generator for generating a prediction signal based on the dominant time domain periodicity of the input signal; a first discrete frequency domain transform generator for generating a frequency domain representation of the input signal; a second discrete frequency domain transform generator for generating a frequency domain representation of the prediction signal; a subtractor to subtract at least a portion of the frequency domain representation of the prediction signal from the frequency domain representation of the input signal to generate an error signal; and a generator to generate an output signal from the error signal and parameters defining the prediction signal. A corresponding decoder is also described.
Inventors: | Cohen; Gilad (Haifa, IL); Cohen; Yossef (Nesher, IL); Hoffman; Doron (Kiryat Motzkin, IL); Krupnik; Hagai (Haifa, IL); Satt; Aharon (Haifa, IL) |
Assignee: | International Business Machines Corp. (Armonk, NY) |
Appl. No.: | 034516 |
Filed: | March 4, 1998 |
Apr 03, 1997[EP] | 97480009 |
Current U.S. Class: | 704/207; 704/206; 704/219; 704/227; 704/230 |
Intern'l Class: | G10L 019/12 |
Field of Search: | 704/270,500,226,222,224,230,219,203,265,208,206,220,200,217,207 |
5596676 | Jan., 1997 | Swaminathan et al. | 704/208. |
5684920 | Nov., 1997 | Iwakami et al. | 704/203. |
5734789 | Mar., 1998 | Swaminathan et al. | 704/206. |
5749065 | May., 1998 | Nishiguchi et al. | 704/219. |
5828996 | Oct., 1998 | Iljima et al. | 704/220. |
5909663 | Jun., 1999 | Iljima et al. | 704/226. |
5926768 | Jul., 1999 | Nishiguchi | 704/265. |